Articulating fluid



Patented Sept. 28, 1925.

UNITED STATES MEYER SEGAL, OF CHICAGO, ILLINOIS.

ARTICULATIIIG FLUID.

N 0 Drawing.

The present invention relates to a surface contact detecting composition, that is to say a composition which is to be applied to one of two surfaces, before bringing the other surface into contact therewith, to show upon said second surface the points or point of contact of the first surface therewith. The invention is of particular utility in connection with dental work, that is to say for fitting crowns, facings, etc., upon teeth or roots of teeth, in'order to determine when the two surfaces will contact with each other over substantially their entire area. In its preferred form the composition consists of glycerine, water and lamp black or other form of carbon pigments, preferably in the proportion of ten 0. c. of glycerine, live 0. c. of water and two grams of lamp black, but it will be understood that the proportions can be varied more or less, the amount of water can be somewhat more or somewhat less than that abo e stated, and the amount of carbon can be varied from about one gram up to two and one half grams, with the quantities of the glycerine and water stated. In the preferred form of producing the composition, the glycerine and water are first mixed together by stirring or agitation, and this operation can be conducted at room temperature or at higher or lower temperature as desired. The carbon is then added to the mixture and thoroughly incorporated by stirring or agitation until a homogeneous mass or coating composition is produced.

A thin layer of the composition can be applied upon a surface of a tooth, to which say a porcelain crown is to be attached, and by pressing the porcelain crown against the coated root stump or part of a tooth, it is easy to see where the one or more points of contact come, after which grinding with the ordinary grinding wheels used by dentists can be conducted upon the crown, and by repeated alternate testing and grind ing, a very accurate fit or contact of the two surfaces can be produced. The tooth and the crown are then thoroughly cleaned and are cemented together in the usual and well known manner.

Application filed February 6. 1926.

Serial No. 86,658.

The composition is particularly suitable for use in dental work or in other arts where the grinding wheel or disk of carborundum or similar material is to be used, because the mixture does not gum up or clog the grinding disk or wheel.

The glycerine used is preferably chemically pure, although good relatively pure glycerine such as is used in medicine can be used. If already substantially diluted, correspondingly less water than above indicated should be used. The carbon black preferably used is that known as the Peerless brand, although other forms can be used.

Preferably, though not necessarily, I add to the above composition a suitable material to impart a pleasant scent and odor thereto. In example, a small amount of oil of wintergreen may be added to the above composition in the proportion of approximately one drop of oil of Wintergreen to one half fluid ounce of the fluid composition. The oil of wintergreen may be used in its pure and undiluted condition and commercial oil of wintergreen diluted with to 90% alcohol may be used. It is also possible to use synthetic Wintergreen if desired. Oil of cinnamon and other products suitable for this purpose may be substituted for oil of Wintergreen, as will be understood, though ordinarily I prefer to use oil of Wintergreen.

I claim 1. A surface contact testing composition comprising glycerine mixed with a smaller amount of water, and with a sufficient amount of lamp black to produce a uniform black liquid composition.

2. A surface contact testing composition comprising glycerine, water and carbon in the proportions of 10 c. c. of C. P. glycerine, 5 c. c. of water and 1 to 2 grams of lamp black.

3. A surface contact testing composition comprising glycerine, water and carbon in the proportion of 10 c. c. of C. P. glycerine, 5 c. c. of water and 2 grams of lamp black.

In testimony whereof I affix my signature.

MEYER SE GAL. 

